[alsa-devel] UCM/DAPM - saving power when idle?

David Henningsson david.henningsson at canonical.com
Thu Nov 1 11:39:01 CET 2012

I don't deal much with ASoC, so sorry if I'm missing something obvious 

When a certain use case is activated, that would then activate some DAPM 
widgets, causing the codec to consume more power. So, we should 
essentially avoid this unless we're actually playing back/recording. 
But, why isn't there a "disable all use cases" command, or possibly an 
"idle" command? (That, essentially, e g pulseaudio should set whenever 
playback/recording stops)

Or; the option would be that the codec is actually powered down, but 
only activates itself when there is a stream; but this looks like it 
could cause problem with loopback paths (e g listening to FM radio, 
where there are no streams passing through CPU/main memory).

David Henningsson, Canonical Ltd.

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